netdev - Re: /128 link-local subnet on 6in4 (sit) tunnels?

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Date:	Wed, 27 Mar 2013 16:12:10 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Wilco Baan Hofman <wilco@...nhofman.nl>
Cc:	netdev@...r.kernel.org
Subject: Re: /128 link-local subnet on 6in4 (sit) tunnels?

On Tue, Mar 26, 2013 at 11:04:17PM +0100, Wilco Baan Hofman wrote:
> I was trying to get OSPFv3 working on NBMA 6in4 tunnel on linux 3.8, but
> it does not work. I noticed it uses a /128 fe80 link-local subnet
> instead of the rfc4213[1]-mandated /64.. This breaks bird (likely for
> other reasons), but also interoperability with cisco, which mandates
> OSPFv3 NBMA on link-local addresses.
> 
> So I was wondering, is there any particular reason for the use of a /128
> link-local or is this just a bug?

Can you show me the commands how you set up the tunnel. It does create /64 ll
with embedded ipv4 addresses for me here on v3.8.

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